High-voltage motor coupling pulling heating device

Abstract

The utility model provides a high-voltage motor coupling pulling heating device, which comprises a gas cylinder and a gas pipe, and the gas pipe is connected to a gas outlet of the gas cylinder; the interior of the heating ring is hollow, and an inner cavity of the heating ring communicates with the air pipe; the ignition ports are formed in the inner circumferential wall of the heating ring and are arranged at equal intervals; the ignition gun is installed on the heating ring, and the ignition end of the ignition gun points to one ignition opening; the fixing ring and the heating ring are arranged at an interval, and the fixing ring is coaxially and fixedly connected with the heating ring; and the locking structure is arranged on the fixing ring and is used for coaxially locking the fixing ring on the coupler. The outer wall of the coupler is evenly heated through the multiple ignition openings distributed in the heating ring at equal intervals, the coupler or a gear hole can be evenly heated to the target temperature within a short time, then the thermal expansion stress of the coupler is evenly distributed, the disassembly and assembly time is remarkably shortened, and the disassembly and assembly efficiency is improved. And physical damage to a shaft, a key groove or a matching surface can be eliminated through disassembly and assembly after heating expansion.

Description

Technical Field

[0001] This application relates to the technical field of coupling heating equipment, and in particular to a high-voltage motor coupling heating device. Background Technology

[0002] With the rapid development of the power industry, large-scale power plants have become the mainstream power generation enterprises, and large generating units have become the mainstay of China's thermal power generation. Power plants, of course, cannot function without high-power electric motors. High-voltage motors in power plants mainly include generators, electric pump motors, coal mill motors, forced draft fans, induced draft fans, primary air fans, booster fans, coal conveyor belt motors, coal crusher motors, closed-loop circulating water pump motors, condensate pump motors, and so on. The normal operation of these motors is directly related to the safe and reliable operation of the generator set. In the overhaul of larger electric motors, disassembling the couplings can sometimes be difficult, increasing the workload of the workers. Therefore, mastering the methods of disassembling electric motor couplings is of great significance for maintenance personnel in power plants, mines, chemical industries, and other similar industries, in order to improve work efficiency and maintenance quality.

[0003] The impact of motor coupling disassembly on worker workload and project timeline: Motor maintenance generally involves procedures such as inspection, disassembly, repair, and reassembly. Heating the motor coupling is required during disassembly and installation. The speed of disassembly and installation determines the length of the motor maintenance project. For general couplings, heating may be sufficient for removal in one go; however, couplings with high tension may require multiple attempts. Improper heating methods or techniques can also prevent coupling removal, leading to project delays, economic losses, and increased workload for workers.

[0004] Conventional motor coupling disassembly typically involves heating, usually using welding or a flame heater. Flame surface heating is an older surface heating method. Flame heating devices use acetylene or other combustible gases as fuel, and flame temperatures can reach 2000-3000°C. The advantages of this method are simple equipment, low investment, convenient power supply, and low production costs. The disadvantages are low flame energy, small heating surface area, slow heating rate, difficulty in temperature control, low thermal expansion force, and small coupling expansion clearance. It is difficult to remove large couplings, but generally easy to remove couplings for small motors, making it suitable for small couplings.

[0005] For larger motor couplings, flame heaters are used. The characteristic of this surface heating is that the area directly exposed to the flame heats up the fastest. In the nearby heat diffusion area, the heater needs to oscillate the flame to even out the temperature. However, due to uneven oscillation speeds during manual operation, the flame heats the coupling surface unevenly, resulting in uneven distribution of thermal expansion stress, making the coupling difficult to remove. Utility Model Content

[0006] To address the issue of uneven surface temperature of couplings caused by manual operation when using a flame heater to heat couplings, this application provides a high-voltage motor coupling heating device.

[0007] The high-voltage motor coupling heating device provided in this application adopts the following technical solution:

[0008] A high-voltage motor coupling heating device, comprising:

[0009] A gas cylinder and a gas hose, wherein the gas hose is connected to the gas cylinder outlet;

[0010] The heating ring is hollow inside and its inner cavity is connected to the air tube.

[0011] The ignition port is provided in multiple equally spaced locations on the inner peripheral wall of the heating ring;

[0012] An ignition gun is mounted on a heating ring, with its ignition end pointing towards one of the said ignition ports;

[0013] A fixed ring, spaced apart from the heating ring, and coaxially fixedly connected to the heating ring; and

[0014] A locking structure is provided on the fixed ring to lock the fixed ring coaxially onto the coupling.

[0015] Furthermore, the heating ring is provided with a variable-length ignition tube structure at the ignition port.

[0016] Furthermore, the variable-length ignition tube structure includes:

[0017] An external threaded sleeve is airtightly installed at the ignition port of the heating ring;

[0018] A metal extension tube is slidably inserted into the external threaded sleeve;

[0019] An airtight ferrule is fitted onto the outer wall of the metal extension tube near the end of the external threaded sleeve; and

[0020] A locking nut is fitted over the airtight ferrule and is threaded to fit the outer thread of the outer threaded sleeve; when the locking nut is threaded to the outer threaded sleeve, the airtight ferrule squeezes and secures the metal extension tube.

[0021] Furthermore, a limiting ring is coaxially fixed to the inner wall of the outer threaded sleeve, and the metal extension tube passes through the limiting ring. The distance between the limiting ring and the end face of the outer threaded sleeve is less than the axial length of the airtight ferrule.

[0022] Furthermore, a retaining ring is fixedly connected to the side of the locking nut away from the outer threaded sleeve, and is slidably sleeved on the outside of the metal extension tube. When the locking nut and the outer threaded sleeve are fully screwed together, the distance between the retaining ring and the limiting ring is less than the axial length of the airtight ferrule.

[0023] Furthermore, the outer wall of the metal extension tube is provided with graduations distributed along its length.

[0024] Furthermore, the locking structure includes three adjusting screws threaded through the fixing ring, the adjusting screws being arranged radially along the fixing ring, and the included angle between two adjacent adjusting screws being 90°.

[0025] Furthermore, two fixed rings are provided at intervals and are coaxially fixed together. The extension lines of the two adjusting screws located in the middle position on the two fixed rings are coplanar and are arranged on both sides of the central axis of the fixed rings.

[0026] Furthermore, the trachea is equipped with a pressurization device and a pressure gauge.

[0027] Furthermore, it also includes a water bath in which the gas cylinder is placed.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By uniformly heating the outer wall of the coupling through multiple equally spaced ignition ports on the heating ring, the coupling or gear hole can be uniformly heated to the target temperature in a short time. This results in a uniform distribution of thermal expansion stress on the coupling, significantly shortening the disassembly and assembly time. Furthermore, disassembly and assembly after heating and expansion can eliminate physical damage to the shaft, keyway, or mating surface.

[0030] 2. After loosening the lock nut, the extension length of the metal extension tube can be adjusted to fit couplings of different sizes; after tightening the lock nut, the airtight ferrule expands radially, which can both lock the metal extension tube and provide an airtight seal between the metal extension tube and the outer threaded sleeve to prevent leakage.

[0031] 3. By tightening the adjusting screws, the retaining rings can be fixed on couplings of different sizes; and by setting up multiple adjusting screws with three oppositely arranged screws on the two retaining rings, the coaxiality of the two retaining rings and the coupling can be ensured, thereby ensuring the coaxiality of the heating ring and the coupling. This can avoid the phenomenon of the heating ring becoming unstable due to the weight of the heating ring causing the retaining ring to deflect on the coupling after a single retaining ring is locked.

[0032] 4. When the acetylene gas pressure is insufficient, heating the gas cylinder with a water bath can accelerate the diffusion of gas inside the cylinder, improve the utilization rate of acetylene gas, and reduce energy waste. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a simplified structural diagram of an embodiment of this application;

[0035] Figure 2 This is a cross-sectional structural schematic diagram of the heating ring and variable length ignition tube structure according to an embodiment of this application.

[0036] Figure label:

[0037] 11. Gas cylinders; 12. Water bath;

[0038] 21. Trachea; 22. Pressurization device; 23. Pressure gauge;

[0039] 3. Heating ring; 31. Ignition port;

[0040] 4. Ignition gun;

[0041] 5. Retaining ring;

[0042] 61. External threaded sleeve; 611. Limiting ring; 62. Metal extension tube; 63. Airtight ferrule; 64. Locking nut; 641. Retaining ring;

[0043] 7. Adjustable pitch screw. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] Reference Figure 1 This application discloses a heating device for a high-voltage motor coupling, comprising:

[0046] Gas cylinder 11 and gas pipe 21. Gas cylinder 11 is used to hold flammable gas, such as acetylene. Gas pipe 21 is connected to the gas outlet of gas cylinder 11. Gas pipe 21 is equipped with a pressurizing device 22 and a pressure gauge 23.

[0047] The heating ring 3 is hollow inside and its inner cavity is connected to the air pipe 21.

[0048] Ignition ports 31 are provided on the inner circumferential wall of heating ring 3 and are provided at equal intervals. Specifically, eight ignition ports 31 are arranged at equal intervals on heating ring 3 at 45° intervals.

[0049] The ignition gun 4 is mounted on the heating ring 3, and its ignition end points to one of the ignition ports 31.

[0050] The fixing ring 5 is spaced apart from the heating ring 3 and is coaxially fixed to the heating ring 3.

[0051] A locking structure is provided on the retaining ring 5 to lock the retaining ring 5 coaxially onto the coupling.

[0052] Therefore, when heating the coupling using the heating device of this application, the acetylene cylinder 11 is first controlled by a valve to pressurize the gas source through the pressurizing device 22, and then delivered to multiple ignition ports 31 on the heating ring 3 through the gas pipe 21. Then, one of the ignition ports 31 is ignited by the ignition gun 4, which in turn ignites the acetylene emitted from the remaining seven ignition ports 31. Subsequently, the heating ring 3 and the fixing ring 5 are fitted together onto the coupling to be disassembled and fixed by the locking structure, which ensures that the heating ring 3 and the coupling remain coaxial. At this time, the flames at the multiple ignition ports 31 uniformly heat the outer wall of the coupling, which can uniformly heat the coupling or gear hole to the target temperature in a short time. This results in a uniform distribution of thermal expansion stress on the coupling, significantly shortening the disassembly and assembly time. Furthermore, disassembly and assembly after heating and expansion can eliminate physical damage to the shaft, keyway, or mating surface.

[0053] Furthermore, this application is designed to be compatible with couplings of different sizes.

[0054] On the one hand, refer to Figure 1 and Figure 2 The heating ring 3 is provided with a variable length ignition tube structure at the ignition port 31. The variable length ignition tube structure includes:

[0055] The outer threaded sleeve 61 is airtightly installed at the ignition port 31 of the heating ring 3;

[0056] A metal extension tube 62 is slidably inserted into an outer threaded sleeve 61, and the outer wall of the metal extension tube 62 is provided with graduations distributed along its length.

[0057] An airtight ferrule 63 is fitted onto the outer wall of the metal extension tube 62 near the outer threaded sleeve 61. The airtight ferrule 63 is made of heat-resistant rubber.

[0058] The locking nut 64 is fitted over the airtight ferrule 63 and is threadedly matched with the outer threaded sleeve 61. When the locking nut 64 is threadedly connected to the outer threaded sleeve 61, the airtight ferrule 63 squeezes and fixes the metal extension tube 62.

[0059] Furthermore, a limiting ring 611 is coaxially fixed to the inner wall of the outer threaded sleeve 61, and a metal extension tube 62 passes through the limiting ring 611. The distance between the limiting ring 611 and the end face of the outer threaded sleeve 61 is less than the axial length of the airtight ferrule 63.

[0060] Additionally, a retaining ring 641 is fixedly connected to the side of the locking nut 64 away from the outer threaded sleeve 61 and is slidably sleeved outside the metal extension tube 62. When the locking nut 64 and the outer threaded sleeve 61 are fully screwed together, the distance between the retaining ring 641 and the limiting ring 611 is less than the axial length of the airtight ferrule 63.

[0061] Therefore, when heating couplings of different sizes, the locking nut 64 can be loosened first to release the airtight ferrule 63. At this point, the locking force of the airtight ferrule 63 on the metal extension tube 62 is reduced, allowing the metal extension tube 62 to be freely moved to a suitable length. Specifically, the scale on it can be used to unify the total length of multiple variable-length ignition tube structures, ensuring heating uniformity. After the metal extension tube 62 is adjusted, the locking nut 64 is tightened. After the locking nut 64 is tightly screwed onto the outer threaded sleeve 61, the retaining ring 641 presses the airtight ferrule 63 against the limiting ring 611, causing the airtight ferrule 63 to expand radially. This both locks the metal extension tube 62 and provides an airtight seal between the metal extension tube 62 and the outer threaded sleeve 61, preventing leakage. If necessary, after tightening, soapy water can be applied to the connection area to check for bubbles and any signs of leakage.

[0062] On the other hand, refer to Figure 1 The locking structure includes three adjusting screws 7 threaded through the fixing ring 5. The adjusting screws 7 are arranged radially along the fixing ring 5, and the included angle between two adjacent adjusting screws 7 is 90°. There are two fixing rings 5 ​​spaced apart and coaxially fixed together. The extension lines of the two adjusting screws 7 located in the middle position on the two fixing rings 5 ​​are coplanar and arranged on both sides of the central axis of the fixing ring 5. Specifically, the three adjusting screws 7 on one fixing ring 5 are distributed in the 12 o'clock, 9 o'clock, and 3 o'clock directions, and the three adjusting screws 7 on the other fixing ring 5 are distributed in the 3 o'clock, 6 o'clock, and 9 o'clock directions.

[0063] Therefore, by tightening the adjusting screw 7, the fixing ring 5 can be fixed on couplings of different sizes; and by setting up multiple adjusting screws 7 with three oppositely arranged on the two fixing rings 5, the coaxiality of the two fixing rings 5 ​​and the coupling can be ensured, thereby ensuring the coaxiality of the heating ring 3 and the coupling. This can avoid the phenomenon of instability of the coaxiality of the heating ring 3 caused by the deflection of the fixing ring 5 on the coupling due to the gravity of the heating ring 3 after a single fixing ring 5 is locked.

[0064] Furthermore, referring to Figure 1The heating device of this application also includes a water bath 12, in which the gas cylinder 11 is placed. When the acetylene gas pressure is insufficient, heating the gas cylinder 11 using the water bath 12 can accelerate the diffusion of gas inside the cylinder, improve the utilization rate of acetylene gas, and reduce energy waste.

[0065] The implementation principle of the high-voltage motor coupling heating device in this application embodiment is as follows:

[0066] When heating the coupling using the heating device of this application, the acetylene cylinder 11 is first controlled by a valve to pressurize the gas source. After being pressurized by the pressurizing device 22, the gas is delivered through the gas pipe 21 to multiple ignition ports 31 on the heating ring 3. Then, one of the ignition ports 31 is ignited by the ignition gun 4, which in turn ignites the acetylene emitted from the remaining seven ignition ports 31. Subsequently, the heating ring 3 and the fixing ring 5 are fitted together onto the coupling to be disassembled and fixed by a locking structure to ensure that the heating ring 3 and the coupling remain coaxial. At this time, the flames at the multiple ignition ports 31 uniformly heat the outer wall of the coupling, which can uniformly heat the coupling or gear hole to the target temperature in a short time. This results in a uniform distribution of thermal expansion stress on the coupling, significantly shortening the disassembly and assembly time. Furthermore, disassembly and assembly after heating and expansion can eliminate physical damage to the shaft, keyway, or mating surface.

[0067] When heating couplings of different sizes, first loosen the locking nut 64 to release the airtight ferrule 63. At this time, the locking force of the airtight ferrule 63 on the metal extension tube 62 is reduced, and the metal extension tube 62 can be freely moved to a suitable length. Specifically, the scale on it can be used to unify the total length of multiple variable length ignition tube structures to ensure heating uniformity. After the metal extension tube 62 is adjusted, continue to tighten the locking nut 64. After the locking nut 64 is tightly screwed into the outer threaded sleeve 61, the retaining ring 641 presses the airtight ferrule 63 onto the limiting ring 611, causing the airtight ferrule 63 to expand radially. This can both lock the metal extension tube 62 and provide an airtight seal between the metal extension tube 62 and the outer threaded sleeve 61 to prevent leakage.

[0068] By tightening the adjusting screw 7, the fixing ring 5 can be fixed on couplings of different sizes; and by setting up multiple adjusting screws 7 with three oppositely arranged on the two fixing rings 5, the coaxiality of the two fixing rings 5 ​​and the coupling can be ensured, thereby ensuring the coaxiality of the heating ring 3 and the coupling. This can avoid the phenomenon of the coaxiality of the heating ring 3 becoming unstable due to the influence of the gravity of the heating ring 3 after a single fixing ring 5 is locked.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heating device for a high-voltage motor coupling, characterized in that, include: A gas cylinder and a gas hose, wherein the gas hose is connected to the gas cylinder outlet; The heating ring is hollow inside and its inner cavity is connected to the air tube. The ignition port is provided in multiple equally spaced locations on the inner peripheral wall of the heating ring; An ignition gun is mounted on a heating ring, with its ignition end pointing towards one of the said ignition ports; A fixed ring, spaced apart from the heating ring, and coaxially fixedly connected to the heating ring; and A locking structure is provided on the fixed ring to lock the fixed ring coaxially onto the coupling.

2. The high-voltage motor coupling heating device according to claim 1, characterized in that, The heating ring is provided with a variable-length ignition tube structure at the ignition port.

3. The high-voltage motor coupling heating device according to claim 2, characterized in that, The variable-length ignition tube structure includes: An external threaded sleeve is airtightly installed at the ignition port of the heating ring; A metal extension tube is slidably inserted into the external threaded sleeve; An airtight ferrule is fitted onto the outer wall of the metal extension tube near the end of the external threaded sleeve; and A locking nut is fitted over the airtight ferrule and is threaded to fit the outer thread of the outer threaded sleeve; when the locking nut is threaded to the outer threaded sleeve, the airtight ferrule squeezes and secures the metal extension tube.

4. The high-voltage motor coupling heating device according to claim 3, characterized in that, A limiting ring is coaxially fixed to the inner wall of the outer threaded sleeve, and the metal extension tube passes through the limiting ring. The distance between the limiting ring and the end face of the outer threaded sleeve is less than the axial length of the airtight ferrule.

5. A high-voltage motor coupling heating device according to claim 4, characterized in that, The locking nut is fixed to a retaining ring that is slidably sleeved on the outside of the metal extension tube on the side opposite to the outer threaded sleeve. When the locking nut and the outer threaded sleeve are fully screwed together, the distance between the retaining ring and the limiting ring is less than the axial length of the airtight sleeve.

6. A high-voltage motor coupling heating device according to claim 3, characterized in that, The outer wall of the metal extension tube is provided with graduations distributed along its length.

7. A high-voltage motor coupling heating device according to claim 1, characterized in that, The locking structure includes three adjustable screws threaded through the fixing ring, the adjustable screws being arranged radially along the fixing ring, and the included angle between two adjacent adjustable screws being 90°.

8. A high-voltage motor coupling heating device according to claim 7, characterized in that, The fixed rings are spaced apart and coaxially fixed together. The extension lines of the two adjusting screws located in the middle position on the two fixed rings are coplanar and are arranged on both sides of the central axis of the fixed rings.

9. A heating device for a high-voltage motor coupling according to claim 1, characterized in that, The trachea is equipped with a pressurization device and a pressure gauge.

10. A heating device for a high-voltage motor coupling according to claim 1, characterized in that, It also includes a water bath, in which the gas cylinder is placed.

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